Its leaves look like a black eyed susan are they fuzzy? black eyeds have fuzzy leaves. Typically black eyed susans are a perennial (comes back year after year) and yes those do spread like crazy.. I find them in my grass and all.

I've grown the Goldstrum variety of black-eyed susans for years, but never cut it back so I can't answer your question. I don't see what harm it would do if you cut back any unattractive flower stalks a foot or so. Just leave the leaves at the base. I always cut the flower stems down anyhow come late fall. Right now in Z7, Virginia, my black-eyed susans are getting a little ragged, with many of the flower petals drying. Maybe in your zone you still have nice flowers. I'd hate to cut mine back if they still had good petals. You could hold off and cut back in a week or two. But from my experience, I really don't think any perennial reblooms with the same quality as its first spring blooms.

Black Eyed Susans bloom in my garden that time of year, but I'm much farther south. You might want to consider the fact that they push gobs of yellow pollen out and it might stain your bridesmaid's dresses. I purposely don't use them in bouquets for this reason. It sounds very pretty and like you're going for a more informal, country wedding look. You should definitely ask some local growers in your area what will be blooming at that time.

I think most black eyed susans are biennials, so it should bloom next summer, then reseed and die. The first year plants that come up your third summer (from next summer's blooms/seeds) probably won't bloom, so likely won't have flowers that 3rd year (but you should have lush green growth, which is still pretty and helps keeps weeds down). But after that, you should have continuous reseeding and flowering every year. If you definitely want flowers the 3rd year, add another plant next summer for blooms the following (3rd) summer. They can be heavy spreaders. If you don't want it to spread all around, you can "sort of" control it by spreading the seeds yourself in the Fall instead of nature letting it go wild all over - just take seed heads and sprinkle only where you want the next crop to come up, then cut off other seed heads so they don't get scattered as much.